apparatus for constituting musical sound signal



FIG. 1 is a top plan of an apparatus constituting musical sound signal showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right-side view thereof;

FIG. 5 is a left-side view thereof; and,

FIG. 6 is a rear view thereof. 

The ornamental design for apparatus for constituting musical sound signal, as shown. 